<%@page import="java.io.File" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    //如果已经安装了本系统，那么就转向主页
    String lockFile = ".." + "/" + "data" + "/" + "install.lock";
    if (new File(lockFile).exists()) {
        response.setHeader("locaion", "../");
    }
%>